I haven't played Cyberpunk 2077 for a while and wanted to see if anything has changed since the last time.

I'm running version 1.12, and I remember getting to that version using updates, but the only update patches that are available for download are "Patch (1.23 to 1.3)" and "Patch (1.31 to 1.5)".

Both updates give the same error "This patch does noet support your version of the game please download a new installer". Where can I find 1.12 to 1.23 / does anyone have it?

I have all of them, but that's like 72 GB of patch files (1.2 - 1.31). Just 1.2 to 1.23 is 36 GB.
This is why i download and store everything locally, precisely to avoid issues like this.
I do not trust files stored online to not randomly disappear.

Just to help you search and get everything, what you're missing from beyond 1.12 is the following:
Cyberpunk.2077.Update.v1.2-GOG
Cyberpunk.2077.Update.v1.21-GOG
Cyberpunk.2077.Update.v1.22-GOG
Cyberpunk.2077.Update.v1.23-GOG
Cyberpunk.2077.Update.v1.30-GOG
Cyberpunk.2077.Update.v1.31-GOG
Cyberpunk.2077.Update.v1.31.AVX-GOG (not really sure what this is, but it was on the official patch list)

And then lastly the 1.5 patch.

You can maybe find a .torrent for the game. They usually include all the patches from way back to 1.06.

An alternative would be to download the entire game at version 1.5, delete your current Cyberpunk 2077 game directory (just delete the game files, not uninstall it), and install the game as new. I've done that several times (which is why I like GoG games so much), it won't screw up anything.

Removing patches is such a dumb idea on GoG's part.

Yeah, I don't get it - they keep the earliest ones, but remove the ones in the middle...?

Downloading the updated installer, deleting the install directory, and reinstall the whole thing (plus any mods) seems to be the most effective way to go about things.

Either that or download each and every patch file as they come and keep them stored offline. That's what I do. No need for GoG Galaxy or any such nonsense game clients. Takes up a LOT of storage space though (~200 GB just in Cyberpunk patches, and that's excluding the 1.03 base game).